Description: On systems with / (rootfs) mounted via network (like NFS), and where the network runs DHCP, shutting down and rebooting may fail. This happens when Arch gets to "Sending SIGTERM To Processes", and this step gets stuck in BUSY. This occurs because the dhcp client (in my case, dhcpcd) is sent a SIGTERM, and nicely releases the lease on the IP address it has. This causes a loss of network connectivity, the root filesystem no longer functions and the whole system appears to lock up.

I've fixed this on my end by adding a call to "add_omit_pids( $(pidof dhcpcd))" before the shutdown. This results in killall5 being passed an option telling it to not kill dhcpcd. As a net result, my system once again cleanly shuts down and reboots.

One reasonable fix would be to have /etc/rc.d/network also add $(pidof dhcpcd) to omit_pids if we are stopping network, and NETWORK_PERSIST="yes", but there are many other possible solutions as well.



Steps to reproduce:
Run a system that boots off NFS. Configure an IP address via DHCP. Attempt to shut down the machine.